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Thanks for this. Extremely interesting (I study art as well haha) - and I believe I have a lot to lose aesthetically, even with my relatively severe underbite, in due partly to the reasons you mention above.

Am I correct when saying that the inclination of the soft tissue below the base of the nose is mostly controlled by the inclination of the front teeth? If so, can this be reliably predicted with presurgical orthodontics?

In essence, are you saying that the key to how the maxilla is perceived in real life is the difference in angle between the vertical plane of the (lf2 minus lf1 area) and the lf1 part of the maxilla? Since that the defines where the light and shadow falls on the face under natural lighting?

Worth trying MSE + FM (I'm 19) to try pull the entire maxilla a whopping 1-2 mm forward?

The plan doesn't change your forehead. It's a double jaw surgery that advances your recessive midface area and also advances your lower jaw. So the areas that are NOT the forehead being ADVANCED would most certainly not make your forehead look relatively larger. Quite the contrary, the DJS advancement would tend to make the forehead look  less advanced by relative comparison.

It looks like a case that could be solved by just moving the maxilla forward, but 8mm is a lot. It would change your nose. So he's probably right you don't need double jaw, but double jaw might produce a better result by splitting the difference in the movement of each jaw. Some people get sag under the neck when moving the mandible back, though, and there's probably some apnea risk, too. I'd say get some more consults and ask about these things.